6 citations · 27 across the 12 of their papers we have counts for
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math.GR2004★ 3 cited
Nonvanishing of algebraic entropy for geometrically finite groups of isometries of Hadamard manifolds
Roger C. Alperin, Guennady A. Noskov
We prove that any geometrically finite (nonelementary) group of isometries of a pinched Hadamard manifold has uniform exponential growth.
math.HO2004
Trisections and Totally Real Origami
Roger C. Alperin
We introduce a trisection axiom for mathematical origami and descibe the totally real origami numbers. We also discuss the solution of Alhazen's problem and its relation to trisect…
math.GR2004★ 4 cited
Separability of Solvable Subgroups in Linear Groups
Roger Alperin, Benson Farb
Let G be a finitely generated linear group over a field of characteristic 0. Suppose that every solvable subgroup of G is polycyclic. Then the claim is made that any solvable subgr…